FANUC Series 0i-MODEL F Plus. CONNECTION MANUAL (FUNCTION)

6. INTERPOLATION FUNCTION

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- Threading start angle increment

The threading start angle (Q) increment is 0.001 degrees. Note that no decimal point can be specified.
Example:

For a shift angle of 180 degrees, specify Q180000.

Q180.000 cannot be specified, because it contains a decimal point.

Note: Q1 is the command of 0.001 degree for the angle for shifting the threading start angle, regardless of

the setting of the followings.

- Increment system IS-A/B/C (Parameter No.1013#3-#0)
- Pocket calculator type decimal point programming (Bit 0(DPI) of parameter No.3401)
- The least input increment is 10 times greater than the least command increment (Bit 7(IPR) of

parameter No.1004)

- Specifiable threading start angle range

The threading start angle (Q) of between 0 and 360000 (in 0.001-degree units) can be specified. If a value
greater than 360000 (360 degrees) is specified, it is rounded down to 360000 (360 degrees).
If a minus value is specified, it works as a plus value.
Example:

If Q-90000 (-90 degrees) is specified, it works as Q90000 (90 degrees).

- Multiple threading cycle (G76 (G code system A/B)) (G78 (G code system C))

The address Q of the G76/G78 multiple threading cycle command is used for the minimum cutting depth
or the depth of cut in 1st cut. For this reason, the angle for shifting the threading start angle can not be
commanded.
However, if the FS15 tape format is used, in G76/G78 multiple threading cycle, the address Q is possible
to specify the angle for shifting the threading start angle.

Parameter

3451

GQS

[Input type] Parameter input

[Data type] Bit path

#0 GQS

When threading is specified, the threading start angle shift function (Q) is:

Disabled.

Enabled.

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6.5.6

Circular Threading

Overview

Using the G35 and G36 commands, a circular thread, having the specified lead in the direction of the
major axis, can be machined.

L: Lead

Circular thread

Fig. 6.5.6 (a)

NOTE

The "thread cutting cycle retract" is not effective for G35, G36.

Parameter

3405

G36

[Input type] Parameter input

[Data type] Bit path

#3 G36

As a G code to be used with the automatic tool length measurement function (M

series)/automatic tool offset function (T series) is:
0:

G36 (T series only)/G37 is used.

G37.1/G37.2/G37.3 is used.

NOTE

If it is necessary to perform circular threading G36
(counterclockwise), set this parameter to 1.

3451

GQS

[Input type] Parameter input

[Data type] Bit path

#0 GQS

When threading is specified, the threading start angle shift function (Q) is:

Disabled.

Enabled.

Alarm and message

Number

Message

Description

PS5058

G35/G36 FORMAT ERROR

A command for switching the major axis has been specified for
circular threading. Alternatively, a command for setting the length
of the major axis to 0 has been specified for circular threading.

6. INTERPOLATION FUNCTION

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Reference item

Manual name

Item name

OPERATOR’S MANUAL (B-64694EN)

Circular threading

6.5.7

Arbitrary Speed Threading

6.5.7.1

Arbitrary speed threading

Overview

In conventional threading, spindle speed could not be changed because tool movement could not
synchronize with spindle rotation, and machining accuracy of a screw is decreased. This function makes it
possible to  change spindle speed during threading. This function can be used with threading, threading
cycle, and multiple threading cycle. Changing spindle speed can prevent the vibration that occurs during
threading at the  specific spindle speed for  a  large size machine. Besides, for repetitive machining, the
same thread shape can be machined  even if spindle speed is changed between rough machining and
finishing machining. Cs contour control is required for this function.

Fig.6.5.7.1 (a) Arbitrary speed threading

Furthermore, even if a workpiece is removed from a chuck before threading is not finished, re-machining
of this workpiece can be achieved. Refer to the section “6.5.7.2 Re-machining thread” for details.

Format

Mxx ; Start of arbitrary speed threading

G32IP_F_; Threading command

Myy ; Cancel of arbitrary speed threading

: M code set in parameter No.11487

: M code set in parameter No.11488

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Explanation

The system enters arbitrary speed threading mode according to the sequence of arbitrary speed threading
mode change by specifying the M code set in parameter No.11487 (start of arbitrary speed threading).
Then, threading (threading, threading cycle, or multiple threading cycle) is specified. Arbitrary speed
threading mode is canceled by specifying the M code set in parameter No.11488 (cancel of arbitrary
speed threading). Arbitrary speed threading is enabled by setting bit 0 (AST) of parameter No.11485 to 1.
Example of machining program

N1G00 X10.Z50.;
N2S_;

: specifying the spindle speed

N3Mxx;

: start of arbitrary speed threading

N4G92X151.0Z-200.F10.;

: start of threading cycle

N5X150.0;
N6X149.0;
N7X148.0;
N8G00;

: cancel of threading cycle

N9Myy;

: cancel of arbitrary speed threading

The same thread shape can be machined in threading cycle specified N4 to N7 blocks, even if the spindle
speed is changed.

NOTE

1  M code for arbitrary speed threading must be specified alone in a block.
2  M code for arbitrary speed threading prevents buffering.
3  Start command of arbitrary speed threading must be specified in canned cycle

cancel mode for drilling. .

4 M code of arbitrary speed threading cancel must be specified after canceling

threading mode. If the M code is specified in threading mode, the alarm PS0529,
“THREADING COMMAND IMPOSSIBLE” is issued.

5 During arbitrary speed threading mode, feedback pulse of a position coder must

be the one from the spindle which is commanded Mxx (xx is set in parameter
No.11487).

6 If threading, threading cycle, or multiple threading cycle is specified when

arbitrary speed threading mode is canceled, usual threading is executed.

- Command in arbitrary speed threading mode

Arbitrary speed threading can be used with the following threading commands.

Table 6.5.7.1 (a) Threading commands used with arbitrary speed threading

Machining center system

Lathe system

G code system

Threading

G33

G32

G33

Threading cycle

－

G92

G78

G21

Multiple threading cycle

－

G76

G78

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NOTE

1 When continuous threading is executed, the lead along the feed axis (the first

axis on the plane) must not be changed between threading blocks.

2 If the next block of threading command (G32: lathe system in G code system A,

G33: machining center system) does not include threading, the feedrate is
decelerated at the end point of threading command.

3 If a taper angle is lower than that of the previous block in continuous threading, or

if a chamfering angle is lower than the taper angle in threading cycle, the alarm
PS0529 is issued. Machining program must be created as the direction of
chamfering during arbitrary speed threading is in the hatching area of Fig. 6.5.7.1
(b).

Fig. 6.5.7.1 (b) Chamfering during arbitrary speed threading

- Change of arbitrary speed threading mode

Cs contour control high speed switching signals are used for arbitrary speed threading. The spindle
control mode is switched from spindle rotation control to Cs contour control without stopping spindle
rotation when arbitrary speed threading mode is selected. To cancel arbitrary speed threading mode, Cs
contour control change signal CON <Gn027.7> or Cs contour control change signals in each axis CONS
<Gn274.0 to 3> is set to “0” in M code of canceling arbitrary speed threading, then, spindle control mode
is switched from Cs contour control to spindle rotation control without stopping spindle rotation. The
following parameter setting is required to change arbitrary speed threading mode.

Table 6.5.7.1 (b) Parameters to set for change of arbitrary speed threading mode

Parameter number

Description

ROT(No.1006#0)

Type of rotary axis(Please set to 1)

ROS(No.1006#1)

Type of rotary axis(Please set to 0)

ROAx(No.1008#0)

Whether to use the roll-over function of a rotary axis(Please set to 1)

RRLx(No.1008#2)

Whether Relative coordinates to be rounded by the amount of shift per rotation(Please set
to 1)

CSDRCT(No.4002#4)

Whether to use the rotation direction signal (SFR/SRV) on Cs contouring control(Please
set to 1)

No.4504

Cs contour control high speed switching : Reference position establishment speed

No.4505

Cs contour control high speed switching : Reference position establishment acceleration

The case of Z- direction, X+ direction

The case of Z+ direction, X+ direction

The case of Z- direction, X- direction

The case of Z+ direction, X- direction

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Parameter number

Description

No.4506

Cs contour control high speed switching : Bell shaped acceleration/deceleration time
constant for the reference position establishment

No.4507

Cs contour control high speed switching : Reference position establishment completion
level

AST(No.11485#0)

Whether to use the function of arbitrary speed threading

No.11487

M code to start arbitrary speed threading mode

No.11488

M code to cancel arbitrary speed threading mode

No.11489

Acceleration in arbitrary speed threading

Rotation direction in Cs contour control may be different from that in spindle rotation control according
to machine configuration or parameter setting. In this case, SV reverse signals SVRVS1 to SVRVS8
<Gn523> are set to “1” before changing to the arbitrary speed threading mode. Also when the arbitrary
speed threading mode is canceled, SV reverse signal is set to “0”.

Example of reverse rotation direction in Cs contour control

-The case of the following machine configuration:

When the motor rotation direction is plus, the spindle rotation direction is minus owing to the gear
between the motor and the spindle.
Forward rotation/Reverse rotation command signal SFR/SRV specifies the motor rotation direction in
spindle rotation control, on the other hand these signals specify the spindle  rotation direction in Cs
contour control. Therefore, the relationship between command, motor rotation direction, and spindle
rotation direction is as follows.

Spindle rotation control:
Command (+) – Motor rotation direction (+) – Spindle rotation direction (-)

Cs contour control:
Command (+) – Motor rotation direction (-) – Spindle rotation direction (+)

NOTE

1 When bit 1 (ART) of parameter No.11486 is set to 0, if reset operation is executed

in arbitrary speed threading mode, Cs contour control change signal CON
<Gn027.7> or Cs contour control change signals in each axis CONS <Gn274.0 to
3> must be set to “0” to cancel arbitrary speed threading mode. If an automatic
operation is restarted without performing this operation, alarm PS0529
“THREADING COMMAND IMPOSSIBLE” is issued. When bit 1 (ART) of
parameter No.11486 is set to 1, if reset operation is executed, arbitrary speed
threading mode is maintained. To cancel arbitrary speed threading mode, the
arbitrary speed threading mode cancellation M code (parameter No.11488) is
specified, and Cs contour control change signal CON <Gn027.7> or Cs contour
control change signals in each axis CONS <Gn274.0 to 3> must be set to “0”.

2 Cs contour control change signal CON must be set to “1” after the speed arrival

signal SARA to SARD <Fn045.3, Fn049.3, Fn168.3, Fn266.3> become “1” when
arbitrary speed threading mode is changed.

3 SV reverse signal setting must be decided after checking the rotation direction in

spindle rotation control and that in Cs contour control by changing arbitrary speed
threading mode with a speed of 0[min-1] (S0) once.

4 Reference position return of Cs contour control axis must be performed once

after power-on to detect one-rotation signal of a spindle.

6. INTERPOLATION FUNCTION

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- Sequence of arbitrary speed threading mode change

Spindle rotation control

Cs contour control

spindle speed

Reference position establishment

0min

-1

Cs contour control change signal

CON<Gn027.7>

Cs contour control high speed

switching signals

CONH<Gn549.0~Gn549.3>

Reference position establishment

starting signals

CSYC<Gn304.3, Gn308.3,

Gn312.3, Gn316.3>

Reference position establishment

completion signal

CSYFN<Fn047.7, Fn051.7,

Fn170.7, Fn268.7>

One-rotation signal detection

status signals for Cs contour control

CS1DT<Fn047.6, Fn051.6,

Fn170.6, Fn268.6>

threading

Mxx ;

Myy ;

Cs contour control high speed

switching completion signals

CSMC<Fn546.0~Fn546.3>

auxiliary function strobe signal

MF<Fn007.0>

end signal

FIN<Gn004.3>

Fig.6.5.7.1 (c) sequence of arbitrary speed threading mode change

- Spindle speed override

Spindle speed override signals SOV0 to SOV7 <Gn030> are available. If the override for individual
spindles is enabled, SOV20 to SOV27 <Gn376> (second spindle), SOV30 to SOV37 <Gn377> (third
spindle), SOV40 to SOV47 <Gn378> (forth spindle) are available, too.
However, changing the spindle speed override is disabled during the following period.

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After the Cs contour control change signal CON is set to “1” until the reference

position establishment completion signal CYSFN becomes “1”.

- After threading starts until the feedrate of feed axis (the first axis on the plane) arrives at the

commanded speed.

NOTE

1 If spindle speed override in each path is used, not only the spindle speed of the

spindle in arbitrary speed threading mode but also the spindle speed of spindles
in the same path is not changed according to spindle speed override signals.

2 As the spindle speed gets higher, the incorrect thread length is longer. Machining

program must be created considering the incorrect thread length which is
changed according to the range of spindle speed override in arbitrary speed
threading mode.

Fig.6.5.7.1 (d) Period in which changing spindle speed override is prohibited

- Acceleration/Deceleration of spindle in arbitrary speed threading

It is possible to switch the acceleration of a spindle according to spindle speed when the spindle speed
override is changed in arbitrary speed threading. There are two switching points, which is set in parameter
No.11020 and No.11021. Besides, acceleration of each section is set in parameter No.11030, No.11031,
and No.11032.

speed[min

-1

]

time[sec]

Fig.6.5.7.1 (e) Acceleration/deceleration of spindle in arbitrary speed threading

: value set in parameter No.11020 (Acceleration is switched at S

[min

-1

].)

feedrate

time

Changing spindle speed override is
prohibited in this period.

FANUC Series 0i-MODEL F Plus. CONNECTION MANUAL (FUNCTION) - page 130